package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import java.net.FileNameMap;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {

        //校验手机号
        if(RegexUtils.isPhoneInvalid(phone))
        {
            //不符和规则，返回错误信息
            return Result.fail("手机号格式错误！");
        }

        //符合生成验证码
        String code = RandomUtil.randomNumbers(6);

        //保存验证码到Redis中
       stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY +phone,code,LOGIN_CODE_TTL , TimeUnit.MINUTES);

        //发送验证码
        log.info("发送短信验证码成功，验证码：{}",code);

        //返回ok
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {

        //校验手机号
        String phone=loginForm.getPhone();
        if(RegexUtils.isPhoneInvalid(phone))
        {
            return Result.fail("手机号格式错误！");
        }

        //校验验证码,从Redis获取校验码
        String cashCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        if(cashCode==null||!cashCode.equals(loginForm.getCode()))
        {
            return Result.fail("验证码错误！");
        }


        //根据手机号查询用户
        User user = query().eq("phone", phone).one();


        //判断用户是否存在
        if(user==null)
        {
            //user数据库中该用户不存在

            //不存在根据手机号创建新用户，保存到数据库中
            user=createUserWithPhone(phone);

        }

        //保存用户信息到redis中
        //随机生成令牌token,作为登录令牌
        String token = UUID.randomUUID().toString(true);

        //将user对象转为HashMap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        //将javaBean对象装换位hashMap
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create().setIgnoreNullValue(true)
                        .setFieldValueEditor((fileName,fileValue)->fileValue.toString()));

        //存储
        stringRedisTemplate.opsForHash().putAll(LOGIN_USER_KEY+token,userMap);

        //设置token有效期
        stringRedisTemplate.expire(LOGIN_USER_KEY+token,LOGIN_USER_TTL,TimeUnit.MINUTES);

        //返回token
        return Result.ok(token);
    }

    private User createUserWithPhone(String phone) {

        //创建用户
        User user=new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX+RandomUtil.randomString(10));
        //保存到数据库中
        save(user);

        return  user;

    }
}
